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From "Philippe Laflamme (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (TEPHRA-297) Inconsistent reads
Date Thu, 03 Jan 2019 18:36:00 GMT

     [ https://issues.apache.org/jira/browse/TEPHRA-297?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

Philippe Laflamme updated TEPHRA-297:
    Affects Version/s:     (was: 0.14.0-incubating)

> Inconsistent reads
> ------------------
>                 Key: TEPHRA-297
>                 URL: https://issues.apache.org/jira/browse/TEPHRA-297
>             Project: Tephra
>          Issue Type: Bug
>    Affects Versions: 0.15.0-incubating
>            Reporter: Philippe Laflamme
>            Assignee: Poorna Chandra
>            Priority: Major
> It is possible to get inconsistent reads in the following test setup:
>  * modify the BalanceBooks example to verify the balance periodically (say every second)
as opposed to only at the end.
>  * start multiple transaction servers
>  * start the modified BalanceBooks example
>  * randomly restart the transaction servers
> Running this for long enough will eventually lead to the balance verification to fail, reading
uncommitted or partially committed data.
> The modified BalanceBooks example can be found here:
> https://github.com/plaflamme/incubator-tephra/commit/6caeff5d76f193cdf2e0ad861059bc19cf894705
> The logs of the various services can be found here: [https://gist.github.com/plaflamme/238a6539da9da1ac3a2e313e05ee82eb]
> In my experimentation, I've found that this problem usually happens after the transaction
server fails to write its snapshot during shutdown. It may be unrelated, but this exception
usually shows up in the logs around the time when the issue is seen on the client.
> This is the relevant section in the logs: [https://gist.github.com/plaflamme/238a6539da9da1ac3a2e313e05ee82eb#file-tephra-service-hbase-master-log-L1360-L1878]
> I've sent a message to the mailing list about this problem: [https://mail-archives.apache.org/mod_mbox/tephra-dev/201812.mbox/%3CCAFYs7S9BgPs_A-1E-K3Q06BfiO7W%3Dh3mZD6-vkjb14R29C-bKw%40mail.gmail.com%3E] Sorry
for the noise, but perhaps a JIRA issue is more appropriate for discussing this.

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